Fibreglass components employed in the marine environment are susceptible to moisture ingress, resulting in a degradation of mechanical properties. The nondestructive testing and evaluation of such materials using acoustic methods is possible under certain conditions, but the detection of internal voids and delaminations is masked by the presence of water in such internal flaws. Herein, we present an investigation into the use of terahertz technology to overcome these limitations, for the detection of damage and water ingress in thick woven glass-fibre composites. This investigation is facilitated by terahertz time-domain spectroscopy, coupled with physical raster scanning to realize object-penetrating imaging. Air-filled defects within the fibreglass volume are clearly identified using this technique. A spectroscopic investigation on the alteration of the terahertz-range dielectric properties of the fibreglass material due to water ingress is performed and a small change is measurable, although likely to be obfuscated by the interaction of terahertz-frequency radiation with the internal fibreglass structure. Moisture-ridden laminates do not impede propagation of terahertz radiation, and therefore wetted materials may be inspected for volumetric defects. A simulation of water-filled volumetric defects shows promise for practical application.

在海洋环境中使用的玻璃纤维部件易受潮气侵入，导致机械性能下降。在某些条件下，可以使用声学方法对此类材料进行非破坏性测试和评估，但是内部空隙和分层的检测被此类内部缺陷中水的存在所掩盖。在这里，我们提出了使用太赫兹技术来克服这些局限性的研究，以检测厚织造玻璃纤维复合材料的损坏和进水情况。太赫兹时域光谱技术与物理光栅扫描相结合，可以实现穿透物体的成像，从而促进了这项研究。使用这种技术可以清楚地识别出玻璃纤维体积内的空气填充缺陷。尽管由于太赫兹频率辐射与内部玻璃纤维结构的相互作用而被掩盖，但仍进行了光谱分析，研究了玻璃纤维材料由于进水而引起的太赫兹范围介电特性的变化，并且可以测量到很小的变化。潮湿的层压板不会阻碍太赫兹辐射的传播，因此可以检查湿润的材料的体积缺陷。充满水的体积缺陷的模拟显示了实际应用的希望。潮湿的层压板不会阻碍太赫兹辐射的传播，因此可以检查湿润的材料的体积缺陷。充满水的体积缺陷的模拟显示了实际应用的希望。潮湿的层压板不会阻碍太赫兹辐射的传播，因此可以检查湿润的材料的体积缺陷。充满水的体积缺陷的模拟显示了实际应用的希望。